SOLUTION: Commonwealth Edison Company's charge for electricity in January 2010 was 9.44 cents per kilowatt-hour. In addition, each monthly bill contains a customer charge of $12.55. If last
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Question 1208892: Commonwealth Edison Company's charge for electricity in January 2010 was 9.44 cents per kilowatt-hour. In addition, each monthly bill contains a customer charge of $12.55. If last year's bills ranged from a low of $76.27 to a high of $248.55, over what range did usage vary (in kilowatt-hours)?
Answer by math_tutor2020(3817) (Show Source): You can put this solution on YOUR website!
x = number of kilowatt-hours
0.0944x = cost in dollars of using that amount of electricity
0.0944x+12.55 = add on the fixed fee of $12.55
The cost is somewhere between $76.27 and $248.55
I'll assume that each endpoint is included.
Subtract 12.55 from all sides.
Divide all sides by 0.0944
The usage of kilowatt-hours is somewhere between 675 and 2500.
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